check engine MERCEDES-BENZ CLS 2014 User Guide

iFor information on infants and children
traveling with youinthe vehicle as well as
restraint systems for infants and children,
see "Childreninthe vehicle"
(Ypage 60).
SRS (Supplemental Restraint System)
Introduction
RS consistsof:
RTheRS warning lamp
RAir bags
RThe air bag control unit with crash sensors
REmergency Tensioning Device for the front
seat belts and the outer seat belts in the
rear
RSeat belt force limiters for the front seat
belts and the outer seat belts in the rear
RS reduces the risk of occupants coming into
contact with the vehicle's interior in the event
of an accident. It can also reduce the effect
of the forces to which occupants are
subjected during an accident.
SRS warning lamp
GWARNING
If SRS is malfunctioning, child restraint
system components may be triggered
unintentionally or might not be triggered at all
in the event of an accident withahigh rate of
vehicle deceleration. There is an increased
risk of injury, possibly even fatal.
Have SRS checked and repaired immediately
ataqualified specialist workshop.
SRS functions are checked regularly when
you switch on the ignition and when the
engine is running. Therefore, malfunctions
can be detected in good time.
TheSRS warning lamp in the instrument
cluster lights up when the ignition is switched
on. It goes out no later thanafew seconds
after the engine is started.
The SRS components are in operational
readiness when theSRS indicator lamp
goes out while the engine is running.
There isamalfunction if:
RtheSRS warning lamp does not light
up when the ignition is switched on
Rthe engine is running and theSRS
warning lamp does not go out afterafew
seconds
Rthe engine is running and theSRS
warning lamp lights up again.
Safety guidelines for seat belts,
Emergency Tensioning Devices (ETDs)
and air bags
GWARNING
RDamaged seat belts or seat belts that have
been subjected to stress in an accident
must be replaced. Their anchoring points
must also be checked. Only use seat belts
installed or supplied by an authorized
Mercedes-BenzCenter.
RAir bags and pyrotechnic Emergency
Tensioning Devices (ETDs) contain
perchlorate material, which may require
special handling and regard for the
environment. Check your national disposal
guidelines. California residents, see
www.dtsc.ca.gov/HazardousWaste/
Perchlorate/index.cfm.
RAir bags and ETDs are designed to function
onaone-time-only basis. An air bag or ETD
that has deployed must be replaced. PRE-
SAFE®has electrically operated reversible
belt tensionersinaddition to the
pyrotechnic ETDs.
RDo not pass seat belts over sharp edges.
They could tear.
RDo not make any modification that could
change the effectiveness of the seat belts.
RDo not bleach or dye seat belts as this may
severely weaken them. Inacrash they may
not be able to provide adequate protection.
Occupant safety41
Safety
Z

Asaresult, BAS PLUS may not intervene in all
critical situations. There isarisk of an
accident.
Always pay careful attention to the traffic
situation and be ready to brake.
In particular, the detection of obstacles can
be impaired if there is:
Rdirt on the sensorsoranythingelse
covering the sensors
Rsnow or heavy rain
Rinterference by other radar sources
Rthere are strong radar reflections, for
example in parking garages
Ranarrow vehicle travelinginfront, e.g. a
motorbike
Ravehicle travelinginfrontonadifferent line
relative to the center of your vehicle
Following damage to the frontend of the
vehicle, have the configurationand operation
of the radarsensorschecked ataqualified
specialist workshop. This also applies to
collisions at low speeds where thereisno
visible damage to the frontofthe vehicle.
Braking assistance
To preventacollision with the vehicle in front,
BAS PLUS calculates the brake force
necessary if:
Ryou approach an obstacle, and
RBAS PLUS has detectedarisk of collision
When driving ataspeed under 20 mph
(30 km/h):ifyou depress the brake pedal,
BAS PLUS is activated. The increase in brake
pressure will be carried out at the last
possible moment.
When driving ataspeed greater than
20 mph (30 km/h):ifyou depress the brake
pedal sharply, BAS PLUS automatically raises
the brake pressure toavalue adapted to the
traffic situation.
If BAS PLUS demands particularly high
braking force, preventative passenger
protection measures (PRE-SAFE®)are
activated simultaneously.
XKeep the brake pedal depressed until the
emergencybraking situation is over.
ABS preventsthe wheels from locking.
BAS PLUS is deactivated and the brakes
function as usual if:
Ryou release the brake pedal
Rthere is no longerarisk of collision
Rno obstacle is detected in front of your
vehicle
ESP®(Electronic Stability Program)
Important safety notes
iObserve the "Important safety notes"
section (Ypage 66).
GWARNING
If ESP®is malfunctioning, ESP®is unable to
stabilize the vehicle. Additionally, further
driving safety systems are deactivated. This
increases the risk of skidding and an accident.
Drive on carefully. Have ESP®checked at a
qualified specialist workshop.
!Vehicles with 4MATIC: switch off the
ignition when the parking brake is being
tested onabrake dynamometer.
Application of the brakes by ESP®may
otherwise destroy the brake system.
Vehicles without 4MATIC: observe the notes
on ESP®(Ypage 330) when towing the
vehicle witharaised rear axle.
ESP®is deactivated if the warning lamp
in the instrument cluster lights up
continuously when the engine is running.
If thewarning lamp and the
warning lamp are lit continuously, ESP®is not
available due toamalfunction.
Observe the information on warning lamps
(Ypage 269) and display messages which
may be shown in the instrument cluster
(Ypage 238).
68Driving safety systems
Safety

XTo deactivate:press buttonuntilthe
ESP®OFF warning lamp lights up in
the instrument cluster.
TheOFFmessage appearsinthe
multifunctiondisplay.
Deactivate ESP®when drivingon
designated roads when the vehicle's own
oversteeringand understeering
characteristics are desired. Drivingwithout
ESP®requiresanextremely qualified and
experienced driverwho is able to cope with
these critical driving conditions.
XTo activate:briefly press button.
The ESP®OFF warning lamp in the
instrumentcluster goes out. TheON
message appears in the multifunction
display.
ESP®is activated automatically when the
engine is started.
If ESP®is deactivated and one or morewheels
start to spin,theESP®warninglamp in
the instrumentcluster does not flash. In such
situations, ESP®will not stabilize the vehicle.
It may be best to deactivateESP®in the
followingsituations:
Rwhen using snowchains
Rin deep snow
Ron sand or gravel
If you deactivateESP®:
RESP®no longer improves drivingstability.
Rtraction control is still activated.
RPRE-SAFE®is no longer available, nor is it
activated if you brakefirmly and ESP®
intervenes.
RPRE-SAFE®Brake is no longer available, it
is also not activated if you brakefirmly and
ESP®intervenes.
RESP®still provides support when you
brake.
Rengine torque is no longer limited and the
drive wheels are able to spin.The spinning
wheels produceacuttingeffect for better
traction.
Vehicles with ECO start/stop function: the
ECO start/stop function switches the engine
off automatically when the vehicle comes to
astop. The engine starts automatically when
the driver wants to pull away again. ESP®
remains in its previously selected status. For
example, if ESP®was deactivated before the
engine was switched off, ESP®remains
deactivated when the engine is switched on
again.
EBD (electronic brake force
distribution)
iObserve the "Important safety notes"
section (Ypage 66).
GWARNING
If EBD has malfunctioned, the rear wheels can
still lock, e.g. under full braking. This
increases the risk of skidding and an accident.
You should therefore adapt your driving style
to the different handling characteristics. Have
the brake system checked ataqualified
specialist workshop.
Observe information regarding indicator and
warning lamps (Ypage 267) as well as
displaymessages (Ypage 240).
EBD monitors and controls the brake
pressure on the rear wheels to improve
driving stability while braking.
Driving safety systems71
Safety
Z

In order to maintain the appropriatedistance
to the vehicle in front and thus prevent a
collision, you must apply the brakes yourself.
Due to the nature of the system, particularly
complicated driving conditionsmay cause
unnecessarywarningsortheunnecessary
intervention of PRE-SAFE®Brake.
Followingdamagetothe front end of the
vehicle, have the configurationand operation
of the radarsensorschecked ataqualified
specialist workshop. This also applies to
collisions at low speeds where thereisno
visible damage to the frontofthe vehicle.
Function
XTo activate/deactivate:activate or
deactivate PRE-SAFE®Brake in the on-
board computer (Ypage 228).
If the PRE-SAFE®Brake is not activated, the

symbol appears in the multifunction
display.
If you approachavehicle in front very quickly,
this function warns you fromaspeed of
approximately4mph (7 km/h). An
intermittent warning tone sounds and the
distance warning signal lamp in the
instrumentcluster lightsup.
XBrake immediately to defuse the situation.
or
XTake evasiveaction provided it is safe to do
so.
Fromaspeed of approximately4mph
(7 km/h), if the driver and frontpassenger
have fastened their seat belts, PRE-SAFE®
Brakecan brake the vehicle automatically at
speeds up to approximately 124 mph
(200 km/h).
You can preventthe intervention of the PRE-
SAFE®Brakeatany time by:
Rdepressingthe accelerator pedal further.
Ractivating kickdown.
Rreleasing the brake pedal.
The brakingaction of PRE-SAFE®Brakeis
ended automatically if:
Ryou maneuver to avoid the obstacle.
Rthereisnolonger any danger ofarear-end
collision.
Rthereisnolonger an obstacle detected in
frontofyour vehicle.
If you approach an obstacle and PRE-SAFE®
Brakedetectsarisk ofacollision, the system
will alert you both visually and acoustically. If
you do not brake or takeevasive action,the
system will warn you by automatically braking
the vehicle gently. If thereisanincreased risk
of collision, preventative passenger
protection measures (PRE-SAFE®)are
activated (Ypage 54). Ifarisk of collision
remains at speeds of over 20 mph
(30 km/h) and you do not brake, takeevasive
action or significantly accelerate, automatic
brakingmay be performed up to and including
emergency braking. Automatic emergency
brakingisnot performed until immediately
prior to an accidentthat can no longer be
avoided.
Theftdeterrent locking system
Immobilizer
The immobilizer prevents your vehicle from
being started without the correct SmartKey.
XTo activate with the SmartKey:remove
the SmartKey from the ignition lock.
XTo activate with KEYLESS-GO:switchthe
ignition off and open the driver'sdoor.
XTo deactivate:switchonthe ignition.
When leaving the vehicle, always takethe
SmartKey with you and lock the vehicle.
Anyone can start the engineifavalid
SmartKey has been left inside the vehicle.
iThe immobilizer is always deactivated
when you start the engine.
In the event that the enginecannot be
started when the starter battery is fully
charged, the immobilizer may be faulty.
Theft deterrent locking system73
Safety
Z

If you do not open the vehicle within
approximately 40 seconds of unlocking:
Rthe vehicle is locked again.
Rthe theft deterrent locking system is
armed again.
XTo lockcentrally:pressthebutton.
The SmartKey centrally locks/unlocks:
Rthedoors
Rthetrunk lid
Rthefuel filler flap
The turnsignals flash oncewhen unlocking
and three times when locking.
You can also set an audible signal to confirm
that the vehicle has been locked. The audible
signal can be activated and deactivated using
the on-board computer (Ypage 232).
When it is dark, the surround lighting also
comes on if it is activated in the on-board
computer (Ypage 231).
KEYLESS-GO
General notes
Bear in mind that the engine can be started
by any of the vehicle occupants if there is a
KEYLESS-GO key in the vehicle.
Locking/unlocking centrally
You can start, lock or unlock the vehicle using
KEYLESS-GO. To do this, you only need carry
the SmartKey with you. You can combine the
functions of KEYLESS-GO with those of a
conventional SmartKey. Unlock the vehicle
by using KEYLESS-GO, for instance, and lock
it using thebutton on the SmartKey.
When locking or unlocking with KEYLESS-GO,
the distance between the SmartKey and the
corresponding door handle must not be
greater than3ft(1m).
KEYLESS-GO checkswhetheravalid
SmartKey is in the vehicle by periodically
establishingaradio connection between the
vehicle and the SmartKey. This happens:
Rwhen the external door handles are
touched
Rwhen startingthe engine
Rwhile the vehicle is in motion
XTo unlock the vehicle:touch the inner
surface of the door handle.
XTo lock the vehicle:touch sensor
surface.
XConvenience closing feature:touch
recessed sensor surfacefor an
extended period.
XTo unlock the trunk lid:pull the handle on
the trunk lid.
Further information on the convenience
closing feature (Ypage 90).
Changing the settings of the locking
system
You can change the settings of the locking
system. This means that only the driver's door
and the fuel filler flap are unlocked when the
vehicle is unlocked. This is useful if you
frequently travel on your own.
XTo change the setting:press and hold
down theandbuttons on the
SmartKey simultaneously for
SmartKey77
Opening and closing
Z

ProblemPossible causes/consequences andSolutions
The engine cannot be
started using the
SmartKey.
The on-board voltage is too low.
XSwitch off non-essential consumers, e.g. seat heating or interior
lighting, and try to start the engine again.
If this does not work:
XCheck the starter battery and charge it if necessary
(Ypage 324).
or
XJump-start the vehicle (Ypage 326).
or
XConsultaqualified specialist workshop.
The engine cannot be
started using KEYLESS-
GO. The SmartKey is in
the vehicle.
Adoor is open. Therefore, the SmartKey cannot be detected as
easily.
XClose the door and try to start the vehicle again.
There is interferencefromapowerful source of radio waves.
XStart your vehicle with the SmartKey in the ignition lock.
Doors
Important safety notes
GWARNING
If children are left unsupervised in the vehicle,
they could:
Ropen the doors, thus endangering other
people or road users.
Rget out and disrupt traffic.
Roperate the vehicle's equipment.
Additionally, children could set the vehicle in
motion if, for example, they:
Rrelease the parking brake.
Rshiftingthe automatic transmission out of
park positionP
RStart the engine.
There isarisk of an accident and injury.
When leaving the vehicle, alwaystake the
SmartKey with you and lock the vehicle. Never
leave children or animals unattended in the
vehicle. Always keep the SmartKey out of
reach of children.
GWARNING
If persons, particularly children are subjected
to prolonged exposure to extreme heat or
cold, there isarisk of injury, possibly even
fatal. Never leave children unattended in the
vehicle.
Unlocking and opening doors from
the inside
You can openadoor from inside the vehicle
even if it has been locked. If the vehicle has
been locked with the SmartKey or with
KEYLESS-GO, openingadoor from the inside
will trigger the anti-theft alarm system.
Switch off the alarm (Ypage 74).
You can only open the rear doors from inside
the vehicle if they are not secured by the
child-proof locks (Ypage 65).
82Doors
Opening and closing

You could therefore lock yourself out if:
Rthe vehicle is being pushed.
Rthe vehicle is being towed.
Rthe vehicle is onaroller dynamometer.
You can also switchthe automatic locking
function on and off using the on-board
computer (Ypage 232).
Unlocking thedriver'sdoor
(mechanical key)
If the vehicle can no longer be unlocked with
the SmartKey, use the mechanical key.
XTake the mechanical key out of the
SmartKey (Ypage 78).
XInsert the mechanical key intothe lock of
the driver's door as far as it will go.

To unlock
XTurn the mechanical key counter-clockwise
to position
.
The door is unlocked.
XTurn the mechanical key back and remove
it.
XInsert the mechanical key intothe
SmartKey.
If you use the mechanical key to unlockand
open the driver's door, the anti-theftalarm
system will be triggered(Ypage 74).
Locking thevehicle (mechanical key)
If the vehicle can no longer be locked with the
SmartKey, use the mechanical key.
XOpen the driver's door.
XClose the front-passenger door, the rear
doors and the trunk lid.
XPress the locking button (Ypage 83).
XCheck whether the locking knobs on the
front-passenger door and the rear doors
are still visible. Press down the locking
knobs manually, if necessary (Ypage 82).
XClose the driver's door.
XTake the mechanical key out of the
SmartKey (Ypage 78).
XInsert the mechanical key intothe lock of
the driver's door as far as it will go.

To lock
XTurn the mechanical key clockwise as far
as it will go to position
.
XTurn the mechanical key back and remove
it.
XMake sure that the doors and the trunk lid
are locked.
XInsert the mechanical key intothe
SmartKey.
Trunk
Important safety notes
GWARNING
Combustion engines emit poisonous exhaust
gases such as carbon monoxide.Exhaust
gases can enter the vehicleinteriorifthe
trunk lidisopenwhen the engine is running,
84Trunk
Opening and closing

Useful information
iThis Operator's Manual describes all
models and all standard and optional
equipment of your vehicle available at the
time of publication of the Operator's
Manual. Country-specific differences are
possible. Please notethat your vehicle may
not be equipped with all features
described. This also applies to safety-
related systemsand functions.
iRead the information on qualified
specialist workshops: (Ypage 26).
Correct driver's seat position
GWARNING
You could lose controlofyour vehicle if you
do the following while driving:
Radjust the driver'sseat, head restraint,
steering wheel or mirrors
Rfastenthe seat belt
There isarisk of an accident.
Adjust the driver's seat, head restraint,
steering wheel and mirror and fasten your
seat belt before startingthe engine.
XObserve the safety guidelines on seat
adjustment (Ypage 99).
XMake sure that seat$is adjusted
properly.
Electrical seat adjustment (Ypage 100)
When adjusting the seat, make sure that:
Ryou are as far away from the driver's air bag
as possible.
Ryou are sitting inanormal upright position.
Ryou can fasten the seat belt properly.
Ryou have moved the backrest to an almost
vertical position.
Ryou have set the seat cushion angle so that
your thighs are gently supported.
Ryou can depress the pedals properly.
XCheck whether the head restraint is
adjusted properly.
When doing so, make sure that you have
adjusted the head restraint so that the back
of your head is supported at eye level by
the center of the head restraint.
XObserve the safety guidelines on steering
wheel adjustment (Ypage 106).
XMake sure that steering wheelis
adjusted properly.
Adjustingthe steering wheel electrically
(Ypage 106)
When adjusting the steering wheel, make
sure that:
Ryou can hold the steering wheel with your
arms slightly bent.
Ryou can move your legs freely.
Ryou can see all the displays in the
instrumentcluster clearly.
XObserve the safetyguidelinesfor seat belts
(Ypage 55).
XCheck whether you have fastened seat
beltproperly (Ypage 56).
98Correct driver'sseat position
Seats, steering wheel and mirrors

Problems with the windshield wipers
ProblemPossible causes/consequences andSolutions
The windshield wipers
are jammed.
Leaves or snow, for example, may be obstructing the windshield
wiper movement.The wiper motor has been deactivated.
XFor safety reasons, you should remove the SmartKey from the
ignition lock.
or
XSwitch off the engine using the Start/Stop button and open the
driver's door.
XRemove the cause of the obstruction.
XSwitch the windshield wipers back on.
The windshield wipers
fail completely.
The windshield wiper drive is malfunctioning.
XSelect another wiper speed on the combination switch.
XHave the windshield wipers checked ataqualified specialist
workshop.
128Windshield wipers
Lights and windshield wipers

Starting the engine
Important safety notes
GWARNING
If children are left unsupervised in the vehicle,
they could:
Ropen the doors, thus endangering other
people or road users.
Rget out and disrupt traffic.
Roperate the vehicle's equipment.
Additionally, children could set the vehicle in
motion if, for example, they:
Rrelease the parking brake.
Rshift the automatic transmission out of
parking position P.
Rstartingthe engine.
There isarisk of an accident and injury.
When leaving the vehicle, always take the
SmartKey with you and lock the vehicle. Never
leave children or animals unattended in the
vehicle. Always keep the SmartKey out of
reach of children.
GWARNING
Combustion engines emit poisonous exhaust
gases such as carbon monoxide. Inhaling
these exhaust gases leads to poisoning. There
isarisk of fatal injury. Therefore never leave
the engine running in enclosed spaces
without sufficient ventilation.
GWARNING
Flammable materials introduced through
environmental influence or by animals can
ignite if in contact with the exhaust system or
parts of the engine that heat up. There isarisk
of fire.
Carry out regular checkstomake sure that
there are no flammable foreign materials in
the engine compartmentorinthe exhaust
system.
!Do not depress the accelerator pedal
when startingthe engine.
General notes
iThe catalytic converter is preheated for
up to 30 seconds afteracold start. The
sound of the engine may change during this
time.
Automatic transmission
XShift the transmission to positionP.
The transmission position display in the
multifunction display showsP.
iYou can also start the engine when the
transmission is in positionN.
Starting procedurewith the SmartKey
iTo start the engine using the SmartKey
instead of KEYLESS-GO, pull the Start/
Stop button out of the ignition lock.
XTurn the SmartKey to position3in the
ignition lock (Ypage 147) and release it as
soon as the engine is running.
Using KEYLESS-GO to startthe engine
iThe Start/Stop button can be usedto
start the vehicle manually without inserting
the SmartKey into the ignition lock. The
Start/Stop button must be inserted in the
ignition lock and the SmartKey must be in
the vehicle. This mode for starting the
engine operates independently of the ECO
start/stop automatic engine start function.
XDepress the brake pedal and keep it
depressed.
XPress the Start/Stop button once
(Ypage147).
The engine starts.
Driving149
Driving and parking
Z